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SH7018 Datasheet(PDF) 351 Page - Renesas Technology Corp

Part # SH7018
Description  SuperH??RISC engine
PDF  431 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

SH7018 Datasheet(HTML) 351 Page - Renesas Technology Corp

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16.6.2
User Program Mode
After setting FWP, the user should branch to, and execute, the previously prepared
programming/erase control program.
As the flash memory itself cannot be read while flash memory programming/erasing is being
executed, the control program that performs programming and erasing should be run in on-chip
RAM or external memory.
Use the following procedure (figure 16.11) to execute the programming control program that
writes to flash memory (when transferred to RAM).
Execute user application
program
Execute programming/
erase control program in RAM
(flash memory rewriting)
Transfer programming/erase
control program to RAM
FWP = 0
(user program mode)
Write FWP assessment program
and transfer program
1
2
3
4
5
Figure 16.11 User Program Mode Execution Procedure
Note:
When programming and erasing, start the watchdog timer so that measures can be taken to
prevent program runaway, etc. Memory cells may not operate normally if
overprogrammed or overerased due to program runaway.



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